Improvement in joinersj squares



UNITED STATES PATENT OFFICE.

JOHN TSEMAN, OF ROSSTON, PENNSYLVANIA.

llViPROVENlENT IN JOINERSl SQUARES.

Speeifieation forming part ol' Letters Patent No. 35,15), dated May G, 1862.

Be it known that l, JOHN ,ISEMAN of Ross ton, in the. eount)Y ot' Armstrong and State of Pennsylvania, have invented a new and use ful Implement or Device for Joiners Use, and which l terni a Piteh-Square, and l do hereby deelare that the lfollowing is a full, clear, and exaet deseription oi.' the saine, reterenee being had to the aeeompanying drawings, -making a part ot' this speeieation, in whichd Figure l is a side view ol m v inv -\ntion; Fig. 2, an edge view ol' the same; Figs. Cl, i, 5, and t, side views ofi' the saine, shtnving the adaptabilit'vot' the implement to various puri poses.

Similar .letters ot' sponding parts in the several ligures.

rllhis invention eonsists in inserting in a straight wooden stoel( or st raight-edgo a joinors or earpenter`s square in sueh a inanner that the length otf rafters tor a root may h'v a very simple adjustment oli' the parts oi the iimpli-:ment be aeeuratelv aseertainet'l, the height ot" the rooiand the length ot' the spa-ee being given, the implement also being capable ot being used as a t[wing-square, T-square, or miter, as hereinafter l'ull)Y shown and deseribei'l. 'llo enable those skilled in the art to ullv understand and eonslruet m v invent ion, l will proceed to describe il.

A represents a joiiu1"sorearpent ers square construetedot' metal, as usual, but having bol h blades o [i slotted longitudinall)v nearlytheir whole length, as shown at e e in Figs. l, il, and l. 'lhis square is graduatial at its outer part into inehesand sixteenths, and at its inner parts into iuehes and twellfths, the latter graduation being the most ('-onvenient tor measuringthelenglh ol,A ra t'ters, asthetwell'ths eorrespoiul to l'oit-measnrements.

'llhe square A is fittedV in a wooden stoehv or straight-edge, ll, whieh is li'ormed ol' two longitudinal parts, d (l, eonneeted by dowel or steady pins e e, whieh' keep said parts in a proper relative position with eaeh other. (See Fi The square A is seeured on the stoel( or straight-(alge l by means oli' bolts (l C, which pass through oblonglongitudinal slotsff in the steek, and through the slotsf' e in the square, the bolts C C being provided with thumb-nuts l), which adniit ol' the bolts being readily loosened when desired in order to adjust the square in the stock.

i toot. referenee indieate eorre- The edge ot' the stoel; .Il which is opposite the angle of the square is graduated into ine/hes, as shown in Fig. 2, the inches from O to (j, inclusive, being subdivided into twelfths, and at each side of those point-s subdivided into sixteenths.

The implement; is used as follows: Suppose, t'or instance, that it is required to ascertain the length oi' the rafters of a roof the span of which is thi rtv-two (32) feet and the perpendieular height sixteen (1G) feet. The square A is so set in the stock or straight-edge B that its shortest blade, u, will he in Contact with the t'ourth division on said blade-that is, supposing a quarter ineh is to represent a The blade a therefore represents the perpemlimilar height oi the roof. The blade I) is also set so that the fourth division on it will be in eontaet with the (l or zero-inark on stoek l. 'lhi s blade o, therefore, will represent one-halt' the span ot' the roof, sixteen ij|uarter inehes represent-ing sixteen feet, thirty-two feet 'being the span. It will thus be seen that the portion of the stoel; B hetween the two points whieh are in junction with the square will represent the rafter, the quarter inehes between the two points aforesaid being eounted, and representing feetthe length ot' the ralter.

'l`he o uter gradaiions on the stock l5, the sixteenth divisions of the inehes, eonlorm to the grad uatiol is on the outer part ol' l he square, and the eentral twelfth divisions from (l to ti eontornl to the inner graduations on the square, either grruluaiiou being used, as desil-ed.

'lhe implement may be ad vaniageouslv used l'or laying out the treads ol' a staircase, as shown in Fig. l. lt also ma)v be used asa miter, as shownk in Fig. l, ,l'or a T-square, as shown in Fig. or lor a trying-square, as shown in Fig. o, the square A admitting otf being readily adjusted relativeliv with the stoek li to ett'eet these ends. A spirit-level may be inserted in the steek l, il'l desired.

llavi ng thus deseril'ied myinvention, what l elaim as new, and desire to seeure by Letters Iatent, is-

r.lhe eoinbinatiou ol the square A and straight-edge l-l, arranged and connected together as and tor the purpose herein set forth.

JOHN ISEMAN.

\\` ituesses:

GEO. BovARD, JOHN SHooP. 

